三、观察物体（一）
★单元练习3
建议用时:7分钟
实际用时:分钟
5000+4000 =
700-400+60 =
71÷8 =
598-108 =
900-300+200 =
56÷6 =
256+98 =
9000-4000-500 =
22÷3 =
910-310 =
700-300+400 =
14÷3 =
869-613 =
7000-3000+400 =
32÷4 =
572-122 =
900-400+200 =
44÷9 =
8×3 =
800-400-200 =
51÷7 =
128+82 =
220+60+300 =
24÷6 =
423-399 =
210+150+100 =
35÷8 =
34-2 =
800-300-400 =
52÷6 =
666-456 =
1000+600-300 =
47÷8 =
240+210 =
1300-600+200 =
27÷9 =
729-279 =
1000-300-400 =
18÷6 =
885-204 =
500-400+100 =
29÷6 =
109+169 =
7000-3000+200 =
27÷8 =

5000+4000 = 9000
700-400+60 = 360
71÷8 = 8……7
598-108 = 490
900-300+200 = 800
56÷6 = 9……2
256+98 = 354
9000-4000-500 = 4500
22÷3 = 7……1
910-310 = 600
700-300+400 = 800
14÷3 = 4……2
869-613 = 256
7000-3000+400 = 4400
32÷4 = 8
572-122 = 450
900-400+200 = 700
44÷9 = 4……8
8×3 = 24
800-400-200 = 200
51÷7 = 7……2
128+82 = 210
220+60+300 = 580
24÷6 = 4
423-399 = 24
210+150+100 = 460
35÷8 = 4……3
34-2 = 32
800-300-400 = 100
52÷6 = 8……4
666-456 = 210
1000+600-300 = 1300
47÷8 = 5……7
240+210 = 450
1300-600+200 = 900
27÷9 = 3
729-279 = 450
1000-300-400 = 300
18÷6 = 3
885-204 = 681
500-400+100 = 200
29÷6 = 4……5
109+169 = 278
7000-3000+200 = 4200
27÷8 = 3……3

拓展园地
根据下面的秤来判断,哪个等式是不正确的？（）


A.○ + ☆ =20
B.○ + ☆ +3 =20 +3
C.○ + ☆ -4 =20 -8
D.○ + ☆ -6 =20 -6

C